Question: Where is the most southern point of the continent in which lays Lake Vostok?
Paraphrase: Where is the foremost southern point of the landmass in which lays Lake Vostok?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q152044 wdt:P30 ?X . ?X wdt:P1333 ?answer}
Answer: Point(0.0 -90.0)